VBA multiple Formules

Hello,

I want to do a simple Multiple Formule in VBA

This is my multiple Unit Cost x Quantity I use this line ='Export Freshbooks'!I2*'Export Freshbooks'!J2 etc
The outcome must come on Sheet output ...But its only give #Value

Is there a fix ore line i can use in VBA??TestOUtput.xlsm

Greets